Platinum, gold, colored diamond and diamond ring, Buccellati. Photo Sotheby's Of bombé form, centered by an old European-cut diamond of light yellow hue weighing approximately 5.80 carats, framed by single-cut diamonds weighing approximately 1.75 carats,...

18 Karat Gold, Emerald and Colored Diamond Necklace, Bulgari. photo Sotheby's Set with emerald-cut emeralds weighing approximately 44.50 carats, alternating with cut-cornered rectangular modified brilliant-cut diamonds of light yellow hue weighing approximately...